Makes sense to me
The EPA requires that industrial facilities that discharge water ensure that the water being output doesn't exceed a certain concentration of lead. This is a good idea. The problem is that there are conflicting lead standards, depending on various city, state, and federal guidelines.
We ran into an interesting conflict between these standards: the plastic recycling process here doesn't contribute any lead to the water we use. It contributes other chemicals, which we remove, but no lead. The water we use comes from the Westlake municipal water supply--i.e., the drinking water. Per EPA standards, the water we discharge contains too much lead. I'll give you a moment to consider that fact.
In the meantime, here is a picture of a tank:
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